Buzz when using 1/4 inch cables?

Hi there,
This isn't a question about Logic per se but I figure this would be the best place to get an answer.
So I've found using many different setups that I consistently get a low-level buzzing when monitoring or recording from a 1/4 inch cable.
I've used an M-Audio MobiePre as well as an Apogee Duet with the same issue (although the Duet did do much better at minimizing it). It doesn't come up when recording from microphone XLR's. It happens recording both my several keyboards and electric guitar.
My assumption was that it's a grounding issue. I bought a grounded outlet protector to no avail, tried a few different patch cables, plugged in my mac and keyboard to the same or different outlets in different homes. Tried with the mac running off battery, wi-fi and bluetooth disabled, all the electronics in the house off, cellphone gone, nothing seems to do it. Only once have I managed to get rid of it, but I've never been able to duplicate.
Is this a macbook hardware issue? I'm not sure who I should be calling to troubleshoot this with, Apple, M-Audio, my keyboard or patch cable providers or manufacturers...
Any thoughts would be much appreciated. Thanks for your time,
ADAM

If you are using the SAME 1/4" CABLE, please replace it with another one, and see if the hum goes away.
Otherwise, get a DI with Ground disconnect capability (most have this) and use that to plug into your Mac.
Cheers
PS remove the ground protector... unless you want to blow up your gear!!!

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